Keysight Technologies E8257D Service Manual page 123

Troubleshooting
Troubleshooting the RF Path
2. From
Table 1-21
Frequencies
All frequencies
250 kHz to 2 GHz
250 kHz to 20 GHz
3.2 GHz to 20 GHz/40 GHz
20 GHz to 40 GHz
3. Perform the following steps:
4. Using the RF Path Block Diagram, check the power levels at the points
5. Once the problem is located, verify that the cables between the two
E8257D/67D, E8663D PSG Signal Generators Service Guide
Table 1-21, determine the frequencies where the problem occurs.
Assemblies
A27 40 GHz Doubler (40 GHz models only)
A28 YIG Oscillator
A29 20 GHz Doubler
A30 Modulation Filter
AT1 (Option 1E1)
RF Output Connector
A6 Frac–N
A8 Output
A27 40 GHz Doubler
A29 20 GHz Doubler
A30 Modulation Filter
A25 Highband Coupler/Detector
AT1 (Option 1E1)
RF Output Connector
A23 Lowband Coupler/Detector
A8 Output
A27 40 GHz Doubler (40 GHz models only)
A29 20 GHz Doubler
A30 Modulation Filter
AT1 (Option 1E1)
RF Output Connector
A25 Highband Coupler/Detector
A27 40 GHz Doubler
A30 Modulation Filter
AT1 (Option 1E1)
RF Output Connector
— press Preset
— press Frequency, and set signal generator to frequency in problem
area
— press Amplitude, and set to +25 dBm
— press RF ON/OFF (turn RF On)
— turn ALC Off
— Power Search Manual
— Do Power Search
shown.
assemblies are good before replacing the assembly.
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